#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Yukicoder №73 helloworld
// https://yukicoder.me/problems/no/73
// 問題文が意味不明
// ***********************
// for debug
#define DEBUG

#define NOP do{}while(0)
#ifdef DEBUG
#define TRACE(...) do{printf(__VA_ARGS__);fflush(stdout);}while(0)
#define TRACECR do{printf("\n");fflush(stdout);}while(0)
#else
#define TRACE(...) NOP
#define TRACECR NOP
#endif

#define PRINCR printf("\n")
#define NOCR(strig) do{char *p;p=strchr(strig,'\n');if(p)*p='\0';}while(0)
// The out-of-date function
#define	asctime(...)	asctime_s(...)
#define	ctime(...)		ctime_s(...)
#define	strlen(a)	mystr_len(a)

// for stdio
#define INPUT(str) do{char *p;fgets(str,sizeof(str),stdin);p=strchr(str,'\n');if(p)*p='\0';}while(0)
#define REP(a,b) for(int a=0;a<(int)(b);++a)
#define lolong long long
#define INPBUF (250+2)

// ***********************
#define ALFABET	(26)
#define	aaa(c)	(lolong)alf[(c)-'a']
lolong max(lolong a,lolong b){if(a>b){return a;}return b;}
// ***********************
// 外部変数
lolong	lmax(lolong l ) {
	lolong	lmax = 0;
	for(int i = 2; i < l ; ++i ) {
		lmax = max( lmax , ( i * (i -1) / 2 )*( l - i ) );
	}
	return lmax;
}
lolong	omax(lolong o ) {
	lolong	omax = 0;
	for(int i = 1; i < o ; ++i ) {
		omax = max( omax , ( i * (o -i) ) );
	}
	return omax;
}
// ***********************
int main() {
	char	str[INPBUF];
	int		alf[ALFABET];
	lolong	cnt = 0;

	REP(i,ALFABET) {
		INPUT( str );
		sscanf( str," %d", &alf[i]);
	}
	cnt =  aaa( 'h' )
		 * aaa( 'e' )
		 * aaa( 'w' )
		 * aaa( 'r' )
		 * aaa( 'd' );
	cnt *= lmax( aaa('l') );
	cnt *= omax( aaa( 'o' ));
	printf("%lld\n", cnt);

	return 0;
}